Design a suitable footing for exterior column C1 at corner (assume the live load reduction factor is 20%). The depth of foundation is (1.5+27/30) meter. The average density of backfill material and the footing concrete together may be 2150 kg/m3 while the filling from ground to plinth level is to be 0.75 m of material with average density of 1900 kg/m3. The fy for dowel steel is 300 MPa.